Left channel and usb light flashing

Steady101 Member Posts: 2 Newcomer

Hi guys. As soon as I plug my controller to my computer, the left channel indicator bar starts going up and down and the usb light starts flashing. And my controller does not work. Any ideas please?

I’ll try upload a photo. Controller is Numark 4Trak and computer is Mac. Thanks


  • Uwe303
    Uwe303 Moderator Posts: 2,910 mod
    edited April 2023


    does it the same without traktor opened? Have you tried another USB cable and port? If you open macs midi studio do you see it as device? Has anything changed in your setup?

  • Steady101
    Steady101 Member Posts: 2 Newcomer

    Hi, thanks for the reply.

    It only happens when I plug the USB cable into the laptop.

    Im unable to change the USB cable as its fixed to the controller.

    On my Mac it says device connected.

    Nothing has changed with my computer.

    Its very strange and annoying! Any other ideas? Thanks for your help!

Back To Top